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MATCHING – In the space provided, write the letter of the description that best matches the term or phrase.______ 1. organism in or on which a disease-causing organism lives______ 2. previously unknown cause of disease______ 3. transmits a disease-causing organism to people______ 4. organism that causes disease______ 5. movement from one kind of organism to another a. pathogenb. hostc. vectord. emerging viruse. cross-species transfer MULTIPLE CHOICE – In the space provided, write the letter of the term or phrase that best completes each statement or best answers each question. ______ 6. Pollution alters the environment, encouraging pathogens to breed. Which disease is caused indirectly by pollution?a. AIDSb. Ebolac. cholerad. influenza ______ 7. Nearly three-fourths of infectious diseases are transmitted througha. water.b. air.c. soil.d. people. ______ 8. What environmental change may increase the areas where malaria occurs?a. draining wetlandsb. soil erosionc. destroying habitatsd. global warming ______ 9. Which of the following is an environmental change that may result in more pathogens making a cross-species transfer to humans?a. polluting waterb. soil erosionc. destroying habitatsd. global warming ______10. Human immune deficiency virus is considered an emerging virus because ita. had been controlled until recently.b. was previously unknown.c. developed from two other viruses.d. has become resistant to antibiotics.
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